1. From the Department of Radiology, NHS Greater Glasgow and Clyde, Queen Elizabeth University Hospital, 1345 Govan Rd, Glasgow G51 4TF, Scotland (J.D., G.R., P.D.); Department of Radiology, Weill Cornell Medicine, New York, NY (E.M.H.); and Institute of Cardiovascular and Medical Sciences (G.R.) and School of Medicine, Dentistry and Nursing (P.D.), University of Glasgow, Glasgow, Scotland.